I need your opinions about an app to teach kids healthy eating

Hi all,
I'm a digital designer and I've created a concept of an app to teach children healthy food choices and the idea of 5 basic food groups in a fun and engaging way!

I would appreciate your opinions and feedback about the concept.

The idea is that kids can use smartphones cameras to scan barcodes on food products to 'feed' those products to cute monsters. They have to feed them each of the basic food groups to make the monster grow to the next level.

You can see the prototype of the app here:
projects.invisionapp.com/share/7HBW8ZNZY#/screens/235822547

You can click through it to see how it works.

I would love your feedback on the following aspects:
1. do you see any benefits of using this app by kids?
2. do you see any disadvantages of using this app by kids?
3. in what context would it work? (e.g. at home, in a grocery store, while cooking etc)

Thanks you so much!

Marta